Malicious PDF — malware analysis report

Static analysis result for SHA-256 878a72e5f1eb33ab…

MALICIOUS

PDF

39.8 KB Created: 2020-09-01 02:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95cb82b9f4e2730bb931089e0727e6a8 SHA-1: 23e476ae3b4af82febe44a7fab14594fe61b35c6 SHA-256: 878a72e5f1eb33abb06a225769f68ed5082a3f6283908642494d41e54ce1caa5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for an 'Interjection worksheet for grade 5' but embeds a link to a known malicious redirector. This redirector is likely used to funnel victims to a malicious site or download further malware. The PDF also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO poisoning attempt to improve the ranking of the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=interjection+worksheet+for+grade+5
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/jewidosoku.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0854/files/python_cryptography_module_1._7.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/24058081895.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/anatomie_de_l_appareil_digestif_des_ruminants.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3640/files/antenna_theory_analysis_and_design_fourth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/dilun.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/21263095760.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/72343461481.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/10779337661.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5592/files/exercices_physique_chimie_atomes_ions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cd0.bin
0e9d33f97c4acad33a0594b3c26ce2db50a336f1b228c3939b43e87e1491a6c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD0 5544 bytes
font_01_sfnt_off00006fc6.bin
f2eae00c0cc0ce349b351ceea8f4e3ac5fa75c58081edf2f16f5e366260b2c04
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC6 10472 bytes